I think that the whole stigmatism about being fat in America is that we are supposedly the "best country" in the world... the most wealthy, most technically advanced, blahblahblah. So why can't we get our fatness under control?
I don't think that kids realize how hurtful their comments can be; and I can almost guarantee you, they learned their "comments" from their parents. Adults SHOULD know better. But they don't - not always! My mother broke her neck when I was a hi-school senior. She had to wear a "halo" for 13 months. It was a hideous piece of thing, very "frankensteinish". I took her out shopping one day, and these two boys, aprx 13 years old, were pointing & giggling & making "monster-like" noises. I shot a "mean look" of my own their way, and told them to knock it off. One of them said "She's a frankenstein! Run! Run!" & just giggled. Then their mother came out of the store we were about to go in, and I told her what they said & she just said "Well, you know how boys are." WHAT?!?!?!!? So I said "Yeah, I know how boys are. I also know that if you TEACH THEM BETTER they will ACT BETTER. But I guess that's just too difficult for someone of your intelligence to grasp." (That still pisses me off to this day!)
I don't usually let people's rude or hateful comments get to me - but sometimes I just ain't in the mood, & I'll shoot right back at them. I've got a seriously barbed-wire tongue when the situation calls for it.